Regensburg 2016 – scientific programme

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DF: Fachverband Dielektrische Festkörper

DF 11: Poster

DF 11.4: Poster

Wednesday, March 9, 2016, 18:00–20:00, Poster E

Studying the interplay of nanoparticles and dielectric whispering gallery mode resonators using a generalized Mie theory — •Steffen A. Schmid^1,2, Radius N. S. Suryadharma.¹, Martin Fruhnert¹, Carolin Klusmann², Heinz Kalt², and Carsten Rockstuhl¹ — ¹Institute of Theoretical Solid State Physics, Karlsruhe Institute of Technology, 76128 Karlsruhe, Germany — ²Institute of Applied Physics, Karlsruhe Institute of Technology, 76128 Karlsruhe, Germany

The high quality factors and small modal volumes of whispering gallery mode (WGM) resonators promote their use in sensing applications. Coupling metallic nanoparticles to WGM resonators has recently been suggested to further improve their sensitivity. However, the underlying physical mechanism is currently not fully understood. To answer this question, we consider here a spherically shaped resonator coupled to metallic nanoparticles and use the generalized Mie theory to study all related effects by such quasi-analytical method.

Specifically, we investigate the effect of dielectric and metallic nanospheres on the spectral position and the quality factor of the WGM resonances. To this end, we model the WGM resonator as a large dielectric sphere. Metallic nanoparticles are adjacent to the WGM resonator to improve the sensitivity. The presence of molecules is taken into account by considering them as dielectric nanospheres. Hereby, we obtain a deeper understanding of the physical properties of such a system and deduce engineering guidelines to enhance the sensitivity of WGM resonator based sensors.